INVESTMENT SECURITIES (Investment Securities at an Unrealized Loss Position) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
INVESTMENT SECURITIES
Less than 12 months, Fair Value	$ 1,166,939	$ 1,036,979
Less than 12 months, Unrealized Losses	(65,027)	(17,990)
12 months or longer, Fair Value	242,581	175,681
12 months or longer, Unrealized Losses	(27,175)	(6,743)
Total, Fair Value	1,409,520	1,212,660
Total, Unrealized Losses	(92,202)	(24,733)
States and political subdivisions
INVESTMENT SECURITIES
Less than 12 months, Fair Value	163,055	79,360
Less than 12 months, Unrealized Losses	(12,432)	(1,252)
12 months or longer, Fair Value	9,445	10,864
12 months or longer, Unrealized Losses	(2,012)	(597)
Total, Fair Value	172,500	90,224
Total, Unrealized Losses	(14,444)	(1,849)
Corporate securities
INVESTMENT SECURITIES
Less than 12 months, Fair Value	4,696	8,633
Less than 12 months, Unrealized Losses	(325)	(235)
12 months or longer, Fair Value	28,358	21,960
12 months or longer, Unrealized Losses	(3,182)	(830)
Total, Fair Value	33,054	30,593
Total, Unrealized Losses	(3,507)	(1,065)
U.S. Treasury obligations and direct obligations of U.S Government agencies
INVESTMENT SECURITIES
Less than 12 months, Fair Value	4,808	16,103
Less than 12 months, Unrealized Losses	(54)	(415)
12 months or longer, Fair Value	19,215	10,891
12 months or longer, Unrealized Losses	(1,170)	(153)
Total, Fair Value	24,023	26,994
Total, Unrealized Losses	(1,224)	(568)
Residential - U.S. Government-sponsored entities
INVESTMENT SECURITIES
Less than 12 months, Fair Value	951,100	926,570
Less than 12 months, Unrealized Losses	(50,975)	(15,883)
12 months or longer, Fair Value	170,132	114,747
12 months or longer, Unrealized Losses	(18,038)	(4,110)
Total, Fair Value	1,121,232	1,041,317
Total, Unrealized Losses	(69,013)	(19,993)
Residential - Non-government agencies
INVESTMENT SECURITIES
Less than 12 months, Fair Value	6,336	0
Less than 12 months, Unrealized Losses	(137)	0
12 months or longer, Fair Value	852	938
12 months or longer, Unrealized Losses	(144)	(64)
Total, Fair Value	7,188	938
Total, Unrealized Losses	(281)	(64)
Commercial - U.S. Government-sponsored entities
INVESTMENT SECURITIES
Less than 12 months, Fair Value	36,944	6,313
Less than 12 months, Unrealized Losses	(1,104)	(205)
12 months or longer, Fair Value	14,579	16,281
12 months or longer, Unrealized Losses	(2,629)	(989)
Total, Fair Value	51,523	22,594
Total, Unrealized Losses	$ (3,733)	$ (1,194)

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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